Cisco's Virtual Switching System (VSS) in the Catalyst 6500-series is a Layer 2 technology. The customer (currently w/ a non-VSS dual-core design), is routing at the edge - meaning, they have Cisco 3750 stacks in the closets configured for Layer 3 links (point-to-point /30 subnets between the closets and the core). They're dual-homed to each parent switch (again, non-VSS), so there's EIGRP load-balancing between the two equal-cost uplinks. My questions:
Is it possible/feasible to deploy a unified VSS core design w/ L3 distribution links, or should VSS only be rolled out in environments w/ L2-only access closets?
Given that the customer already has L3 switching at the edge (w/ load-balancing across the dual-homed uplinks), does a VSS core really offer any benefit, performance/scalability-wise?
Thank you - reference links/docs are always appreciated.